F-21 - c1951-1980's. Small camera with spring-motor film advance. Winding knob on top makes it look like a miniature Robot camera. These cameras first started trickling into the western collector market about 1989, and have showed up in increasing numbers since the reunification of Germany and the breakup of the Soviet Union. Originally made for the KGB in a separate area of KMZ. Lack of viewfinder indicates special purpose use. Small ears on each end of the camera body allow it to be latched into position.